Wednesday 17 June 2015 Morning

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1 Oxford Cambridge and RSA F Wednesday 17 June 2015 Morning GCSE GATEWAY SCIENCE PHYSICS B B752/01 Physics modules P4, P5, P6 (Foundation Tier) * * Candidates answer on the Question Paper. A calculator may be used for this paper. OCR supplied materials: None Other materials required: Pencil Ruler (cm/mm) Duration: 1 hour 30 minutes * B * INSTRUCTIONS TO CANDIDATES Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters. Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions. Read each question carefully. Make sure you know what you have to do before starting your answer. Write your answer to each question in the space provided. Additional paper may be used if necessary but you must clearly show your candidate number, centre number and question number(s). Do not write in the bar codes. INFORMATION FOR CANDIDATES The quality of written communication is assessed in questions marked with a pencil ( ). A list of equations can be found on page 2. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 85. This document consists of 28 pages. Any blank pages are indicated. [L/601/6473] DC (NF/SW) 90865/3 OCR is an exempt Charity Turn over

2 2 EQUATIONS energy = mass specific heat capacity temperature change energy = mass specific latent heat efficiency = useful energy output ( 100%) total energy input wave speed = frequency wavelength power = voltage current energy supplied = power time average speed = distance time distance = average speed time s = (u + v) 2 t acceleration = change in speed time taken force = mass acceleration weight = mass gravitational field strength work done = force distance resistance = voltage current v = u + at v 2 = u 2 + 2as s = ut at2 m 1 u 1 + m 2 u 2 = (m 1 + m 2 )v refractive index = magnification = l e = l b + l c speed of light in vacuum speed of light in medium image size object size voltage across primary coil voltage across secondary coil = number of primary turns number of secondary turns power loss = (current) 2 resistance V p I p = V s I s power = work done time power = force speed KE = 1 2 mv2 momentum = mass velocity force = change in momentum time GPE = mgh

3 3 BLANK PAGE Question 1 begins on page 4 PLEASE DO NOT WRITE ON THIS PAGE Turn over

4 4 Answer all the questions. SECTION A Module P4 1 Ksenia and Eva investigate five different variable resistors. They set each variable resistor to the maximum resistance. They keep the voltage the same and use this circuit to measure the current. A V Look at their results. Variable resistor Current reading on ammeter in amps A 0.12 B 0.15 C 0.16 D 0.06 E 0.11 (a) All the wires inside the variable resistors are made of the same material the same thickness. (i) Which of the five variable resistors in the table has the longest wire? Choose from A B C D E answer... [1] (ii) Which variable resistor will have the highest resistance? Choose from A B C D E answer... [1]

5 (b) Ksenia looks inside variable resistor A. 5 Look at the diagram. to power supply to power supply coil of resistance wire slider The slider moves around touching the coil of resistance wire. Draw on the diagram where the slider should be to get the highest current reading. [1] (c) Eva writes down a voltmeter reading for variable resistor B. ammeter reading = 0.15 A voltmeter reading = 0.70 V Calculate the resistance of variable resistor B to 2 significant figures. Resistance of variable resistor B... unit of resistance... [3] Turn over

6 6 2 Arnav collects two sets of information about sound and ultrasound. One is a table and the other is a diagram. Table Wave Type of wave Uses sound ultrasound longitudinal transverse talking to each other measuring blood flow listening to music breaking down kidney stones measuring blood flow X-ray of bones cooking food Diagram rarefaction compression wavelength Describe and explain what is wrong in the table and the diagram. The quality of written communication will be assessed in your answer to this question [6]

7 3 Scientists use several methods to find out when old plants lived. (a) Here is information about two methods. 7 Method Problems Relative Dating Find out where plant fossils are in layers of rocks. Newer rocks are on top of older rocks. The method can be used in very old rocks. Cannot find the exact age of the plant fossils. Absolute Dating This uses carbon dating. The amount of radioactive Carbon-14 can be measured in dead plants. This can be compared with the amount of Carbon-14 in living plants to find the age. Cannot be used for very old dead plants as the amount of Carbon-14 is too low. Describe why scientists might use both methods to find out when old plants lived... [2] (b) Another method uses radioactive dating of rocks by calculating the ratio of two metals in the rocks. One of the metals is uranium. What is the name of the other metal? Choose from lead potassium rubidium strontium thorium answer... [1] Turn over

8 4 Radioactivity is measured by the number of decays per second. Here are measurements from three radioactive sources A, B and C. 8 Number of decays per second Time in minutes Source A Source B Source C (a) Describe what happens to the measurements for all the sources... [2] (b) Source B has the shortest half-life. Explain how the measurements in the table show this... [1] (c) Where does this radiation come from? Choose the best answer from all atoms all elements electrons orbiting the nucleus nucleus answer... [1]

9 5 Patrick walks on a nylon carpet. 9 carpet Patrick becomes charged. Then he receives an electrostatic shock. (a) Describe how Patrick can become charged and suggest how he receives an electrostatic shock... [2] Question 5(b) begins on page 10 Turn over

10 10 (b) Patrick s electrostatic voltage is measured when he walks on the carpet on different days. 10 electrostatic voltage in kv distance walked on carpet in m day with 10% humidity in the air day with 40% humidity in the air (i) Use the graph to describe what happens as Patrick walks along the carpet.... [2] (ii) Use the graph to compare the data for the two days.... [1] (iii) Draw a line on the graph to show what will happen to the electrostatic voltage when there is 20% humidity in the air. [1]

11 11 SECTION B Module P5 6 Chantal does some experiments with light in class. She investigates how light behaves. (a) Chantal shines a beam of white light through a prism. Look at the diagram. white light colour A colour B Complete the sentences about the light. Choose from diffracts frequency green amplitude red reflects refracts violet wavelength When the white light enters the prism it... and disperses into its seven colours. Colour A is.... Colour B has the smallest.... [3] (b) She sends a laser beam through an optical fibre. The laser beam is totally internally reflected as it moves along the fibre. Describe one other use of total internal reflection... [1] Turn over

12 12 (c) Chantal experiments with converging lenses. (i) Write down another name for a converging lens.... [1] (ii) Complete the path of the light ray after it goes through the converging lens. focal point [1] (d) Converging lenses are used in cameras to produce images. Describe the type of image and where it is produced in a camera... [2] (e) Chantal has some converging lenses with different thicknesses. A B C D E She wants to arrange the lenses in the order of their focal lengths. Put the lenses in the correct order. Complete the table. One has been done for you. Focal length in cm Lens B [2]

13 13 7 Electromagnetic waves are used for communication. Look at the information about different waves. Wave Wavelength Frequency A 3.3 m 90 MHz B 15 m 20 MHz C m 50 GHz (a) Which wave is reflected by the ionosphere? answer... Explain why you chose this wave... [2] (b) Which wave can pass through the Earth s atmosphere but is reduced in strength because of absorption and scattering? answer... Explain why you chose this wave... [2] Turn over

14 14 8 Artificial satellites are put into space for scientific research. The satellites are carried into space by rockets. (a) A rocket accelerates steadily from rest and reaches 6000 m / s after 5 minutes. Calculate the average speed and the distance travelled in this time. average speed... m / s distance... m [3] (b) The scientists on the International Space Station (ISS) carry out scientific research. They send their research findings for peer review. Who is involved in this peer review and what do they do?.. [2]

15 9 Chris is trying to demonstrate interference of sound waves to his class. 15 He has a keyboard connected to loudspeakers. Describe how he uses this equipment so that his students can hear the effects of interference and explain how interference occurs. The quality of written communication will be assessed in your answer to this question [6] Turn over

16 16 SECTION C Module P6 10 Enzo connects three input sensors to logic gates to make a logic system. sensor A sensor B D sensor C E Input A is 1 when it is hot and 0 when it is cold. Input B is 1 when it is wet and 0 when it is dry. Input C is 1 when it is light and 0 when it is dark. He completes part of the truth table to show the output at E. Inputs Output A B C D E

17 17 From part of the completed truth table Enzo has found one of the conditions when the output at E is 1. This is when it is cold, dry and light. Name the two logic gates and complete the truth table to find out the other conditions when the output at E is 1. The quality of written communication will be assessed in your answer to this question [6] Question 11 begins on page 18 Turn over

18 18 11 Transformers are used in many different appliances. (a) Which symbol is used for a transformer? Choose from A B C D answer... [1] (b) Complete the sentences about transformers. Use a different word for each sentence. Choose words from AC DC isolating step-down step-up Transformers are devices that work with.... Phone chargers use... transformers. Bathroom shaver sockets producing 230 V output use... transformers. [2]

19 19 (c) The voltage of electricity used in the home is 230 V. The voltage of electricity used for some power lines is more than V. Transformers are used as part of the National Grid. Explain why transformers improve the transfer of electricity to the home... [2] Question 12 begins on page 20 Turn over

20 12 The NPN transistor is the basic building block of electronic components. 20 collector base emitter The currents flowing through the transistor terminals are I c I b and I e. Here are the currents of different transistors. I b in ma I c in ma I e in ma (a) Calculate the three missing values for I e and put your answers in the table. [1]

21 21 (b) Look at the sizes of the currents I b and I c in the table. (i) Describe, in general, how I b is different to I c.... [1] (ii) Explain this difference.... [2] (c) Transistors are being made that are smaller than ever before. This is called miniaturisation. This has allowed companies to make miniature mobile phones. Describe an advantage and a disadvantage of using a miniature mobile phone... [2] Turn over

22 13 AC generators are used to generate electricity. Here is a diagram of a small AC generator. 22 N S (a) Label the four parts of the generator on the diagram. Use the words brush coil magnet slip ring [1] (b) This AC generator generates electricity by rotating the coils of wire. Describe another way electricity can be generated using an AC generator... [1]

23 23 (c) The mains electricity in the UK is supplied at a frequency of 50 Hz. Look at the diagram. It shows two different AC voltages. voltage in V time in ms B A A has a frequency of 50 Hz and a supply voltage of 230 V. Compare these values with the frequency and supply voltage of B. How does the frequency and supply voltage of B compare with A?.. [2] Turn over

24 14 Diodes and capacitors are used to produce a constant DC output. 24 (a) A diode only allows current to flow in one direction. current only flows in this direction through this diode Felix looks at the voltage time graphs from three different circuits, A, B and C. voltage Graph for circuit A time voltage Graph for circuit B time voltage Graph for circuit C time Describe the type of rectification, if any, shown by each graph. State which circuits are the result of using diodes... [3]

25 (b) A capacitor is added to circuit C. 25 Predict what will happen to the voltage on graph C. Draw the line on the axes below. voltage time [1] SECTION D begins on page 26 Turn over

26 26 SECTION D 15 Rene researches the range of sounds that different animals can hear. She finds the lowest and highest frequency sounds the animals can hear. (a) Look at some of her research data. frequency (Hz) 0 increasing frequency ,000 10, ,000 human 20 Hz 20,000 Hz elephant 5 Hz 12,000 Hz dog 50 Hz 45,000 Hz cat 45 Hz 65,000 Hz mouse 1,000 Hz 100,000 Hz bat 2,000 Hz 120,000 Hz beluga whale 1,000 Hz 120,000 Hz dolphin 75 Hz 150,000 Hz (i) Which animal can hear the lowest frequency?... [1] (ii) Which animal can hear the highest frequency?... [1] (iii) Which animal has the largest frequency range of hearing?... [1]

27 (b) Rene s research shows that 27 The average person has a hearing range from 20 Hz up to Hz. Rene tests the hearing range of a group of people. Look at the data she collects. Person Lower frequency limit of hearing in Hz Upper frequency limit of hearing in Hz Frequency range of hearing in Hz Jane Alec Dionne Niamh Evangelos average Rene has not completed her table. (i) Which person has the largest frequency range of hearing? Explain your answer using a calculation.... [2] (ii) Calculate the average upper frequency limit of hearing for this group of people. answer... Hz [2] Turn over

28 (iii) 28 Rene s original research shows a lower frequency limit of human hearing of 20 Hz. The data she collects shows an average lower frequency limit of 19.2 Hz. Suggest reasons for this difference.... [3] END OF QUESTION PAPER Oxford Cambridge and RSA Copyright Information OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website ( after the live examination series. If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity. For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE. OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

GATEWAY SCIENCE B652/02 PHYSICS B Unit 2 Modules P4 P5 P6 (Higher Tier)

H GENERAL CERTIFICATE OF SECONDARY EDUCATION GATEWAY SCIENCE B652/02 PHYSICS B Unit 2 Modules P4 P5 P6 (Higher Tier) *B622150611* Candidates answer on the question paper. A calculator may be used for this